ui/input-barrier: Remove superfluous semicolon

Fixes: 6105683da35
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Message-Id: <20200218094402.26625-11-philmd@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

ui/input-barrier.c

@@ -455,7 +455,7 @@ static gboolean writecmd(InputBarrier *ib, struct barrierMsg *msg)
         break;
     default:
         write_cmd(p, barrierCmdEUnknown, avail);
-        break;;
+        break;
     }
 
     len = MAX_HELLO_LENGTH - avail - sizeof(int);